Complete the following achievements to unlock Xbox Live Gamerscore points.

Achievement	How to unlock
A Friend in Need (5 points)	Finished Chapter Four.
A Man Apart (5 points)	Finished Chapter Six.
Dirty Secrets (5 points)	Finished Chapter Three.
Dust to Dust (5 points)	Finished Chapter Two.
Happy Birthday (15 points)	Sweet sixteen. Snuff said.
Lockdown (5 points)	Finished Chapter One.
Old Habits Die Hard (10 points)	Found all the secret stashes in Moira.
The Dawn's Light (15 points)	Finished Chapter Eight.
The Drop (5 points)	Finished the Prologue.
The Forsaken (5 points)	Finished Chapter Five.
The Hidden City (5 points)	Finished Chapter Seven.
Two Faced (5 points)	Uncovered Lyegrove's secret.